I went over the 100 dB sound limit at my local auto-x yesterday (101.X dB) and need to find a way to get it quieter. I have a JG Edelbrock 4-2-1 header, shortened Invidia test pipe, and an Amuse R1 non-resonated exhaust.

Aside from considering a turndown, I'd like to get a resonated test pipe but it has to be the JDM length (~13"?) and have a USDM collector (2"?). Does that even exist?

I am looking for a bolt-on solution and would prefer not to modify the header or exhaust. I was wondering what options I have.

 

Search for a 13" resonated test pipe and u can buy the flanges you need, or might even get lucky if an exhaust shop has them and can weld them on.

Have u considered nodding the 2" collector on your header for a 2.5" ? If your exhaust is 2.5 inner diameter or 2.36inner diameter it may be beneficial to do so.

If you need flanges, there are plenty on ebay